Asteroids

2021WY4 help

Last update: 2024-04-19 14:36 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.309

Aphelion (Q)

4.809

Eccentricity (e)

0.879

Inclination (i)

12.1

deg

Orbit period (P)

1495.4

Earth MOID

0.18360

U parameter

8.9

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

20.7

mag

Diameter

190 - 400*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-11-28

Observatory

Pan-STARRS 1, Haleakala

Orbit Visualiser

Click the button to start Orbit Visualiser

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.559244

1-sigma variation

0.022973

Unit

Eccentricity (e)

Value

0.879120

1-sigma variation

0.001067

Unit

Inclination (i)

Value

12.1246

1-sigma variation

0.0281

Unit

Long. of Ascending Node (Ω)

Value

282.0401

1-sigma variation

0.1177

Unit

Arg. of Perihelion (ω)

Value

0.5382

1-sigma variation

0.1554

Unit

Mean Anomaly (M)

Value

217.62291

1-sigma variation

2.93824

Unit

Perihelion distance

Value

0.309362

1-sigma variation

Unit

Aphelion distance

Value

4.809126

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.707306

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

3.825039

1-sigma variation

Unit

MOID

Value

0.183605

1-sigma variation

Unit

Orbit Period

Value

1495.4297

1-sigma variation

Unit

U parameter

Value

8.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.27763E-4	2.45078E-5	6.45970E-4	-2.70387E-3	3.56824E-3	-6.75004E-2
e	2.45078E-5	1.13813E-6	2.99940E-5	-1.25543E-4	1.65666E-4	-3.13452E-3
i	6.45970E-4	2.99940E-5	7.90817E-4	-3.31045E-3	4.36911E-3	-8.26189E-2
Ω	-2.70387E-3	-1.25543E-4	-3.31045E-3	1.38584E-2	-1.82909E-2	3.45823E-1
ω	3.56824E-3	1.65666E-4	4.36911E-3	-1.82909E-2	2.41425E-2	-4.56374E-1
M	-6.75004E-2	-3.13452E-3	-8.26189E-2	3.45823E-1	-4.56374E-1	8.63324E0

Date of computation: 2024-02-21 14:29 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.7

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

190 - 400*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

860

Unit

Source

[1]

Normalized RMS of residuals

Value

0.580621

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-11-28.277074

Unit

Source

[2]

Last Observation

Value

2021-12-12.11519

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

44 (1)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

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